Engine Coolant Temperature Sensor P0117 / P0118 | How to Test and Replace

In this video I go through the steps on determining why you may have codes p0117 or p0118. It's easy enough that any one can perform at home. This was performed on a 2010 Subaru Impreza non-turbo. Check with your vehicle's repair manual for testing parameters.

This sensor is happy between 1-1.5v at idle. Below .27v triggers code p0117. Above 4.7v triggers p0118.

P0117 - Engine Coolant Temperature Circuit Low
P0118 - Engine Coolant Temperature Circuit High

Note:
Any attempt to repair automotive parts and/or systems carries risk of personal injury. Always adhere and follow safe practices when working on vehicles. Such as, safety glasses, jack stands, no loose clothing, etc. No guarantee or warranty is implied. Use the information in this video at your own risk. Carsntoys is a member of the Amazon Influencer Program.

Publication, reproduction or distribution of this film is strictly prohibited.

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#p0117 #p0118

[electromejia]

This is one of the best explanations I have seen in a mechanic video!!! Thanks man!!

[Malachishouse]

I just got one if those testers only bc I night something at harbor freight and out of all of the free things that was the most expensive. So, I chose the most expensive since I thought I don't really need any if them but it would cost me less to purchase any of the other if I did happen to need them. Now I know what I can use it for and it's perfect. Thank you so much for this video. My van is 1993 and has over 150, 000 miles. Not quite ready to get rid of it but has a hard time starting. Now I know this could be the problem, if not, at least I can test it to find out. Thank you

[sammyemason]

Thank you so much for going slow and show exactly where part is.

[rattyboi]

Very nice vid, a sparkplug socket also works well. With some engines its easier to get those skinny extender bars for ur ratchet thru the small gaps

[regallac]

Thank You very much for this detailed I had my water pump replaced at an AC repair shop and got this code🤬🤬🤬🤬

[djc]

Dude thanks, great video and very very well explained. I couldn't find no one with a easy step by step tutorial. Thumbs up 👍

[ShoshonSun]

Great video, keep doing them!! Concise, precise, clear, great camera work- awesome!

[patrickwitt]

Best explanation I have seen thus far. Thank you!!!

[loveofchrist]

Thank you sir very very great information I’ve been looking for a video that just makes it simple but there’s a lot of Youtubers out there that talk too much and get to the .20 to 30 minutes later user got to the point didn’t waste my time and that’s what I appreciate about your video thank you so very much God bless you and your family and friends. ✝️✝️✝️

[-MrRichBiker]

you are one smart mechanic, brother, god blessed love all your vids, they help out, so much!! ty

[jpen]

Great job, great video.... my dealership said I have a bad ambient air temperature sensor. 2018 outback 3.6r. I call b.s on the dealership.

[smerk]

Thanks im a subscriber.

Question please :

I changed my coolant temp sensor on my 95 lexus ls 400 but i didnt know i was supposed to disconnect the negative battery post.

Why do we need to disconnect it ?
Did i mess something up ?
What can i potentially damage/cause by not disconnecting the negative battery terminal when i replaced my coolant temp sensor ?

Thank you

Anybody knowledgeable please reply soon.

[timinbovey]

My theory on parts like this is -- once you've gone to the trouble to remove it, just put in a new one. Generally an engine coolant sensor costs under ten bucks. If you've already read the codes you can be 95% sure yours is bad. Not worth the trouble to test, and even if it tests good, why not put in a new one for a few bucks and know you're set for another 100, 000 miles?

[orionxingu]

Good useful info and well explained. Thanks.

[paulkomn]

thanks for the very useful video.
Today i changed the temperature sensor for my opel corsa and the check engine light turned off. Only with 10 euros.

[mechtechtechnician]

Very useful video.I'm MECHANICAL.now understand good or bad sensor

[franknitty]

Thanks bro, this video definitely helped me

[olayinkaolatunde]

Nice video, forgot to add if your sensor is good, then the second option is for one to change the thermostat to fix that code. Obviously you can do reconnect the sensor after confirming it’s good and test just to see if maybe there was a gap earlier or moisture affecting it which you’d have cleaned up but if the code pops back up then you change the thermostat.

Nice Video!

[rjlinnovations]

Thank you for sharing your very informative video tutorials 🙏. I have question? My Jeep Wrangler 2012 is not idling and I didn’t put my car key in the start mode. I unplug the female socket for the radiator fan motor bower and I have 12.38 volts reading?

[SafwanHashmi]

Really awesome video and the best part is HOW TO CHECK THE SENSOR. Thanks a lot for sharing such video.

I had an engine steam wash and after that this code is coming up. Most Probably it will be the wiring Right?